SoIndexedTriangleStripSet.h

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/*=======================================================================
** Author      : Gavin Bell (MMM yyyy)
**=======================================================================*/
/*=======================================================================
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**=======================================================================*/
/*=======================================================================
** Modified by : VSG (MMM YYYY)
**=======================================================================*/
 
 
#ifndef  _SO_INDEXED_TRIANGLE_STRIP_SET_
#define  _SO_INDEXED_TRIANGLE_STRIP_SET_
 
#include <Inventor/nodes/SoIndexedShape.h>
#include <Inventor/SbPImpl.h>
 
class SoCoordinateElement;
class SoNormalBundle;
 
SO_PIMPL_PUBLIC_DECLARATION(SoIndexedTriangleStripSet)
 

//
//  Class: SoIndexedTriangleStripSet
//
//  Indexed set of triangles strips.  Strips are separated by the
//  special index SO_END_STRIP_INDEX (-1).  The N indices in the strip
//  define N-2 triangles, which are formed by indexing into the
//  current coordinates. Depending on the current material and normal
//  binding values, the materials and normals for the triangles or
//  vertices may be accessed in order or indexed. If they are indexed,
//  the materialIndex and normalIndex fields are used.
//
 
// This coordinate index indicates that the current triangle ends and the
// next triangle begins
#define SO_END_STRIP_INDEX      (-1)

class  SoIndexedTriangleStripSet : public SoIndexedShape
{
  SO_NODE_HEADER(SoIndexedTriangleStripSet);
  SO_PIMPL_PUBLIC_HEADER(SoIndexedTriangleStripSet)
 
public:
  int getNumStrips( SoState* state = NULL );

  int getNumTriangles( SoState* state = NULL );
 
  // Constructor
  SoIndexedTriangleStripSet();
 
private:
  // Implements actions
  virtual void GLRender( SoGLRenderAction* action );
 
  virtual void getPrimitiveCount( SoGetPrimitiveCountAction* action );
 
 // Generates default normals using the given normal bundle.
  virtual void generateDefaultNormals( SoState* state,
                                       const SbVec3f* coords,
                                       int numCoords,
                                       SoNormalBundle* nb,
                                       SbBool storeRef = FALSE );

  virtual void shouldGenerateTangents( SoGLRenderAction* /*action*/, const SoShapeStyleElement* /*shapeStyle*/ ) {}
 
private:
  static void initClass();
  static void exitClass();
 
  // return num vertices for test
  virtual int getNumVert( SoState* state = NULL );
 
  // return num strips for test
  virtual int getNumPrim( SoState* state = NULL );
 
private:
  // This enum is used to indicate the current material or normal binding
  enum Binding {
    OVERALL,
    PER_STRIP,
    PER_STRIP_INDEXED,
    PER_TRIANGLE,
    PER_TRIANGLE_INDEXED,
    PER_VERTEX,
    PER_VERTEX_INDEXED
  };
 
  // Generates triangles representing strips
  virtual void generatePrimitives( SoAction* action );
 
  // count primitives
  virtual void countPrim( SoState* state = NULL );
 
  virtual void callSetupIndices( SoState* state, const SoShapeStyleElement* shapeStyle, uint32_t useTexCoordsAnyway );
 
  // render function
  void doRendering( SoGLRenderAction* action, const SoShapeStyleElement* shapeStyle );
 
  // Overrides standard method to create an SoFaceDetail instance
  virtual SoDetail* createTriangleDetail( SoRayPickAction* action,
                                          const SoPrimitiveVertex* v1,
                                          const SoPrimitiveVertex* v2,
                                          const SoPrimitiveVertex* v3,
                                          SoPickedPoint* pp );
 
  ~SoIndexedTriangleStripSet();
 
private:
 
  static const int AUTO_CACHE_ITSS_MIN_WITHOUT_VP;
  static const int AUTO_CACHE_ITSS_MAX;
};
 
#endif /* _SO_INDEXED_TRIANGLE_STRIP_SET_ */